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TofG if you are a non secretor or an Explorer (both further tests you can do beyond just bloodtype) there are times where certain products may have a negative effect... Basically some of us are extra sensitive (myself included), but not everyone is & normally skin care products are not as much of a problem as eating those lectins...

I bathe with a castille soap whose primary ingredient is coco oil. Coco[nut] is an AVOID for my bloodtype. Can avoids, applied topically, cause lectin interaction with the skin?

Castille soap primary ingredient should be Olive oil, not coco oil. It's called Castille soap after the region in spain where it was first produced (with Olive oil).

That being said, some people will have a negative reaction to avoid oils on their skins. If you find that you are one of those people, stop using it and change your soap. Coco oil is an avoid for me too, but I have no problem using it on my skin.

As a general rule, "avoid" oils are fine on the skin. Coconut oil and aloe vera gel are fine to use topically, even if you shouldn't ingest them.

There are, of course, exceptions. Anything with wheat in it will make me sick, even if I touch it rather than eating it. I discovered that shortly after I cut wheat out of my diet, before I changed my kids' diets. I'd clean up Jack's leftover pasta bowl and get sick. It was years before I discovered that I only have that reaction to wheat, not to all gluten. I can buy oatmeal soap and knead spelt bread dough with my hands, and nothing happens to me. I suspect I may have an actual allergy to wheat protein, although I've never had that verified through a lab.

While wheat really affects me, other people have allergies or sensitivities to other natural oils. Coconut oil can be very irritating to some people's skin, if they do REALLY poorly on coconut.

Also, some products are just irritating to the skin- such as some essential oils if they're not diluted enough. Clove oil on a cut is going to sting- even though I can eat cloves (mixed into other foods, of course) without problems. Similarly, castille soaps can be very drying to the skin, even if there's nothing wrong with any of the ingredients in particular.